.left-menu {
  display: -webkit-flex;
  display: -moz-box;
  display: flex;
  -webkit-flex-direction: column;
     -moz-box-orient: vertical;
     -moz-box-direction: normal;
          flex-direction: column;
  width: 234px;
  padding: 20px 0;
  position: relative;
  z-index: 6;
  background-color: rgba(105, 101, 101, 0.6);
}
.left-menu > li {
  padding: 10px 24px 10px 30px;
  width: 100%;
  font-size: 14px;
  line-height: 22px;
  color: #fff;
  display: -webkit-flex;
  display: -moz-box;
  display: flex;
  -webkit-align-items: center;
     -moz-box-align: center;
          align-items: center;
  -webkit-justify-content: space-between;
     -moz-box-pack: justify;
          justify-content: space-between;
  cursor: pointer;
}
.left-menu > li span {
  color: #e0e0e0;
  font-size: 16px;
}
.left-menu > li:hover {
  background-color: #ff6700;
}
.left-menu > li:hover .hide-menu {
  display: -webkit-flex;
  display: -moz-box;
  display: flex;
}